I just had an idea that frankly blew my mind (LOL). I need to share it with you guys:
So, basically it's been known since the time before time that Bionicle stands for Biological Chronicle. It was Faber's initial idea, which, however, is tightly connected with the concept of Mata Nui being one gigantic being or "organism" housing an incredible amount of miniature beings that from his perspective resemble cells, each type serving a unique purpose. It wasn't known what exactly the "Biological Chronicle" meant until it was revealed that the MU is, in fact, the Great Spirit's body (and that's when, I hope, most people realized just how ingenious the name was). So, technically, the "Bionicle" refers specifically to the life and times of Mata Nui, and his internal universe.
It makes me wonder, though, what if the "Bionicle" actually has an in-story role? The Great Beings essentially initiated the construction of the Mata Nui robot so that they could later on rebuild their world. That was its main purpose. What if, however, the "Bionicle" in particular, was a side-project, started by the Great Beings to monitor the activity of all the living "cells" within Mata Nui's body over a very extended period of time. Perhaps someone among the GBs (the typical nutcase outsider that no one ever takes seriously) might've have had a clue that the Matoran and everyone else would eventually develop emotions and ambitions and other seemingly unforeseen characteristics. The "Bionicle" would essentially be a vast log or database, contained on some form of external "server" and it would contain the memories (or "backup") and life experiences of every single being who has every lived in the MU.
It sounds insane, doesn't it? But it is exactly what a Great Being would do, IMHO. And why wouldn't they, considering it would aid them greatly in any future attempts to build new worlds and populate them. It's precisely what a genuine "demiurge" like the Great Beings would implement.
Let me know what you guys think.